CN106093257A - The carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment and technique thereof - Google Patents
The carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment and technique thereof Download PDFInfo
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- CN106093257A CN106093257A CN201610747802.8A CN201610747802A CN106093257A CN 106093257 A CN106093257 A CN 106093257A CN 201610747802 A CN201610747802 A CN 201610747802A CN 106093257 A CN106093257 A CN 106093257A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/26—Conditioning of the fluid carrier; Flow patterns
- G01N30/28—Control of physical parameters of the fluid carrier
- G01N30/34—Control of physical parameters of the fluid carrier of fluid composition, e.g. gradient
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Abstract
The present invention relates to carrier gas cleaning system and the technique thereof of a kind of transformer dissolved gas on-line monitoring equipment, its system includes the pump housing (1) being sequentially connected with, condenser (2), catalytic reactor (3), silica gel tube (5) and 3A molecule screen casing (6), the described pump housing (1) delivers the air in condenser (2), the water vapour in air removed by described condenser (2), described catalytic reactor (3) removes the fuel gas in air by catalysis burning, described silica gel and 3A molecule screen casing (6) remove moisture remaining in air and the moisture of catalytic oxidation generation.The present invention, by air is carried out purified treatment, meets the demand of carrier gas, it is possible to use free air, greatly reduces cost.Whole cleaning system can meet equipment without change in the case of any consumptive material uninterrupted use 1 year or more than, completely remove the demand for carrier gas bottle, thus reduce consumptive material expense and manual maintenance expense.
Description
Technical field
The present invention relates to carrier gas cleaning system and the technique thereof of a kind of transformer dissolved gas on-line monitoring equipment.
Background technology
Flowing in gas chromatogram is carrier gas mutually, and in transformer dissolved gas on-line monitoring equipment, conventional carrier gas is
Nitrogen.Carrier gas enters chromatographic column with component, flows out the gas after post with detector detection, and with recorder trace signal at any time
Between change curve, when component to be measured flow out chromatographic column time, detector just can detect that the concentration of its component.
One of the problem that affects Research Challenges being always gas sensor domain how solving environment epidemic disaster, works as ring
When border epidemic disaster changes, the output signal of sensor can be drifted about, and in air, humiture is the highest, and resistance ratio is downward
Drift about the least, illustrate that the due resistance of resistance value ratio of tested gas is little, measures gas accordingly in the case of humiture raises
Concentration can diminish thus cause measurement error.
The carrier gas of existing transformer dissolved gas on-line monitoring equipment uses nitrogen carrier gas bottle, safeguards as consumptive material
Cost is high.
Summary of the invention
The technical problem to be solved in the present invention is, it is provided that the carrier gas of a kind of transformer dissolved gas on-line monitoring equipment is clean
Change system and technique thereof, it carries out purified treatment to air, meets the demand of carrier gas.
The technical solution adopted for the present invention to solve the technical problems is: a kind of transformer dissolved gas on-line monitoring of structure
The carrier gas cleaning system of equipment, including the pump housing being sequentially connected with, condenser, catalytic reactor, silica gel tube and 3A molecule screen casing, institute
Stating the pump housing and deliver the air in condenser, the water vapour in air removed by described condenser, and described catalytic reactor is by urging
Change burning and remove remaining moisture and catalytic reaction in the fuel gas in air, described silica gel and 3A molecule screen casing removal air
The moisture produced.
In such scheme, described catalytic reactor includes shell and the catalysing tube being arranged in described shell, described catalysis
Loading catalyst in pipe, is provided with heater, is provided with thermal insulation layer outside described heater outside described catalysing tube, described catalysing tube
One end is connected with air inlet pipe, and the other end is connected with escape pipe.
In such scheme, one end of described catalysing tube is provided with sealing lid, and the described lid that seals is threadeded with catalysing tube, described
Catalysing tube is made up of the bi-material that thermal coefficient of expansion is different respectively from the threaded connection place sealing lid.
In such scheme, the carrier of described catalyst is cerium oxide, and the active component of catalyst is 0.5-5wt%Pd.
In such scheme, described catalysing tube surface is provided with temperature sensor, described temperature sensor and temperature protection switch
Electrical connection.
The carrier gas that present invention also offers a kind of transformer dissolved gas on-line monitoring equipment purifies technique, including following step
Rapid:
S1, removed the part water vapour in air by condenser；
S2, the H burnt by catalysis in removal air2, CO and Hydrocarbon；
The moisture that S3, the moisture thoroughly being removed remnants in air by silica gel and 3A molecule screen casing and catalytic reaction are generated.
In such scheme, the carrier of the catalyst that described catalysis burning uses is cerium oxide, and the active component of catalyst is
0.5-5wt%Pd.
In such scheme, the humidity in air after described step S1 processes is not more than 20%.
Implement carrier gas cleaning system and the technique thereof of the transformer dissolved gas on-line monitoring equipment of the present invention, have following
Beneficial effect:
1, the present invention uses condenser to remove the most of water vapor in air, can save silica gel tube and molecule screen casing
Consumption, simultaneously works as the effect of guard catalyst.
2, catalysis burning is typical gas-solid catalysis, the activation energy of reaction by catalyst degradation so that it is
Carry out nonflame reaction, the imperfect combustion product generation oxidation reaction such as CO, hydro carbons under relatively low initiation temperature, produce CO2With H2O,
And release substantial amounts of heat, because its oxidizing reaction temperature is low, so greatly inhibiting the N in air2Form high temperature NOX。
3, the moisture in air and the moisture of catalytic reaction generation can thoroughly be removed by silica gel tube and 3A molecule screen casing.
4, the present invention is by carrying out purified treatment to air, meets the demand of carrier gas, it is possible to use free air, greatly
Reduce greatly cost.Whole cleaning system can meet equipment without change use 1 year in the case of any consumptive material or more than,
Completely remove the demand for carrier gas bottle, thus reduce consumptive material expense and manual maintenance expense.
5, the air through air filtering system is the most not only successfully used as carrier gas, is more used in Dynamic headspace degassing mould
Block.Generally degassing uses unprocessed air that insulating oil purging is displaced oil dissolved gas, and abjection gas is easily by environment
Methane etc. affect, and defecator solves this problem.The air using this defecator manually closes in gas cylinder as carrier gas
Become gas to measure analysis, result zero difference as carrier gas thus avoid the use of online equipment gas cylinder, thus reduce consumption
Material cost and the cost of labor of replacing consumptive material.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is carrier gas cleaning system and the schematic diagram of technique thereof of transformer dissolved gas on-line monitoring equipment of the present invention；
Fig. 2 is the structural representation of catalytic reactor.
Detailed description of the invention
In order to be more clearly understood from the technical characteristic of the present invention, purpose and effect, now comparison accompanying drawing describes in detail
The detailed description of the invention of the present invention.
As it is shown in figure 1, the carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment of the present invention includes being sequentially connected with
The pump housing 1, condenser 2, catalytic reactor 3, silica gel tube 5 and 3A molecule screen casing 6.
It is provided with stop valve between condenser 2 and catalytic reactor 3.It is provided with three-way valve between catalytic reactor 3 and silica gel tube 5
4, three-way valve 4 is provided with air hatch, by air hatch, catalytic reactor 3 air out is carried out GC analysis.3A molecule screen casing 6
Gas outlet be connected with effusion meter 7, effusion meter 7 is connected with stop valve, stop valve connect gas outlet.
The pump housing 1 delivers the air in condenser 2, and the most of water vapor in air removed by condenser 2, in the present embodiment
Remove at least 80%.Catalytic reactor 3 removes the tested fuel gas in air, such as H by catalysis burning2, CO and hydrocarbon
Compound, silica gel and 3A molecule screen casing 6 can remove moisture remaining in air and the moisture of catalytic reaction generation completely.
Use condenser 2 to reduce gas temperature thus reduce humidity.Gas enters condenser 2 through a root length pipe, in order to
Heat is allowed to be lost in the air of surrounding.For improve condenser 2 efficiency often on official road additional heat sink with accelerates dispel the heat.
The flat board that fin excellent heat conductivity metallic aluminium is made, then walk through fin and the torrid zone with fans force air.Due to
When temperature is low, absolute humidity reduces, and saturated steam coagulation Cheng Shuicong device bottom separates out.
Catalysis burning is played an important role in terms of improving the discharge of efficiency of energy utilization and control harmful gas.It is permissible
Make fuel realize at a lower temperature without flame to burn completely, to improving combustion process, reduction reaction temperature, promoting to fire completely
Burn, the aspect such as formation of suppression poisonous and harmful substance has particularly important effect, is an eco-friendly process.Catalysis combustion
Burning is typical gas-solid catalysis, and it is the activation energy of reaction by catalyst degradation so that it is at relatively low initiation temperature
Under carry out nonflame reaction, the oxidation of the imperfect combustion product such as CO, hydro carbons occurs at catalyst surface, produces CO simultaneously2With H2O,
And release substantial amounts of heat, because its oxidizing reaction temperature is low, so greatly inhibiting the N in air2Form high temperature NOx。
As in figure 2 it is shown, the catalytic reactor 3 of the present embodiment includes shell 301 and the catalysing tube being arranged in shell 301
305, loading catalyst in catalysing tube 305, it is provided with heater 303 outside catalysing tube 305, outside heater 303, is provided with thermal insulation layer
302.Under room temperature uses, within interior catalyst pipe 305 temperature reaches 400 degree, surface temperature rise≤40 degree, heat-insulating efficiency is good.Should
Reactor material object volume is little, and thermal insulation layer 302 is thin.Comprising shell 301, whole reactor length is 180 millimeters, and width and height are
60 millimeters, thermal insulation layer 302 thickness is 15 millimeters.
One end of catalysing tube 305 is connected with air inlet pipe 307, and the other end is connected with escape pipe 308, inside reactor gas completely
Close.One end of catalysing tube 305 is provided with sealing lid 306, opens sealing lid 306 to load catalyst.Seal lid 306 and catalysing tube
305 is threaded, and catalysing tube 305 and sealing lid 306 are made up of different bi-materials in threaded connection place, due to both materials
Material thermal coefficient of expansion is different, thus reaches the most airtight during applied at elevated temperature.
Catalysing tube 305 surface is provided with temperature sensor 304, and temperature sensor 304 electrically connects with temperature protection switch.Temperature
Sensor 304 is built in the heater strip thermal insulation layer 302 on catalysing tube 305 top layer, thus monitoring catalysing tube 305 uses more accurately
Temperature, uses temperature protection switch, it is ensured that the use safety of catalytic reactor 3.
The carrier of the catalyst used in the present embodiment is cerium oxide, and the active component of catalyst is 0.5-5wt%Pd, i.e.
The quality of metal Pd is the 0.5-5% of catalyst quality, and its required reaction temperature is 280 DEG C, greatly reduces reaction temperature.
Through experiment, air is stablized lasting flow (25ml/min) with one and is entered catalysing tube 305, by resistance wire to pipe
Heat outside road.It is embedded with a micro temperature sensor 304PT100 at pipeline external pipeline outer wall temperature is controlled
Measure.At pipe outlet, reacted product needle tubing is extracted out in entering laboratory GC and is carried out quantification and qualification.To
For line monitoring, optimal catalyst is can to reduce reaction temperature while possessing conversion ratio certain to hydrocarbon.Based on this
Individual two conditions have carried out great many of experiments.Methane is most difficult to oxidized, contains the CH of about 2.5ppm in general room air4, this
Meaning in the case of not using catalysing tube 305, sensor will be unable to measure the methane of below 2.5ppm concentration.The most ultrapure
Also containing a small amount of methane in air bottle, about at about 0.4ppm, methane concentration of working off one's feeling vent one's spleen at a temperature of certain is less than
0.4ppm, it is believed that this temperature reaches except hydrocarbon effect and meets requirement.It is demonstrated experimentally that using cerium oxide CeO2Noble metal
Catalyst desired reaction temperature is minimum.Owing to cerium oxide has 4f electron structure and the element variable valency of uniqueness, as urging
Agent auxiliary agent not only increases the heat stability of alumina support, and promotes the dispersion of noble metal；And due to Ce4+Having can
Appraising at the current rate property, CeO2There is certain storage and support ability, improve the activity of catalyst.
It is experimentally confirmed at about 300 DEG C catalyst H2、CO、CH4、C2H6、C2H4、C2H2Disposal ability is splendid, with total
Hydrocarbon is that the 40ppm gas flow with 30ml/min detects by catalytic reactor 3 and to gas before and after treatment, its
Result is as shown in table 1, and only methane has extremely low residual, and carbon dioxide has and substantially increases, and experimental result is as follows.
Table 1-laboratory GC measurement result
3A molecular sieve is a kind of synthetic zeolite, and its chemical molecular formula is K12[(AlO2)12(SiO2)12]·xH2O, effectively
Aperture isAfter heat-activated, it becomes the most hydrophilic a kind of porous material.The hygroscopic capacity of 3A molecular sieve can reach
To about 20, it means that every 100g dry molecular sieves can adsorb the water of 20g.
The carrier gas purification technique that present invention also offers transformer dissolved gas on-line monitoring equipment comprises the following steps:
S1, removed the part water vapour in air by condenser, remove the steam of at least 80%.
S2, the H burnt by catalysis in removal air2, CO and Hydrocarbon, the carrier of the catalyst of employing is oxidation
Cerium, the active component of catalyst is the 0.5-5% that quality is catalyst quality of 0.5-5wt%Pd, i.e. metal Pd, and it is required
Reaction temperature is 280 DEG C, greatly reduces reaction temperature.
The moisture that S3, the moisture thoroughly being removed remnants in air by silica gel and 3A molecule screen casing and catalytic reaction are generated.
This invention ensures that gas analysis certainty of measurement, provide a stable and carrier gas of " totally " for gas sensor.
Air after Bei Chuli, in addition to methane has about 0.4ppm residual, can be measured gas (H by gas sensor without other2, CO, CH4,
C2H6, C2H4And C2H2), relative humidity is controlled in ppm rank.
Air filtering system is made up of three parts.First by condenser 2 or alternating temperature silica gel tube 5, extraction air in outdoor is carried out
The pretreatment of moisture, relative humidity controls below 20%.This link has two purposes, and one is in the environment of any humidity
Realize the mode without changing, humidity is tentatively controlled within the specific limits thus reduces by two grades of dehumidifying materials'use amounts；Another
The individual effect being to play guard catalyst, catalyst may cause poisoning after contact large quantity of moisture so that it is active, selection
Property reduce or lose reduce service life.The second part is catalytic reactor 3, and experiment is to three kinds of different ratio noble metals and not
Contrast with carrier, wherein cerium oxide be carrier coating 0.5%-5% palladium effectively more than 280 degree removal air in all can
The gas of oxidized burning, wherein the use of cerium oxide greatly reduces reaction temperature.The reason that catalytic reactor 3 is suitable at this
It is that needing carrier gas to be processed is air, thus has inexhaustible oxygen to burn for complete oxidation；If carrier gas is nitrogen
Deng noble gas then cannot use this kind of purification method.3rd part is that the water vapour in gas after filtering is carried out the degree of depth
Purify.Adsorbent used herein is silica gel and the 3A molecular sieve of 140ml of 190ml, and this partial adsorbates agent is consumable goods, consumption
Guarantee to use 1 year in the case of carrier gas flux is 25ml/min through calculating, according to different life-spans of ambient humidity or more
Long.
Air through air filtering system is the most not only successfully used as carrier gas, is more used in Dynamic headspace degassing mould
Block.Generally degassing uses unprocessed air that insulating oil purging is displaced oil dissolved gas, and abjection gas is easily by environment
Methane etc. affect, and defecator solves this problem.The air using this defecator manually closes in gas cylinder as carrier gas
Become gas to measure analysis, result zero difference as carrier gas thus avoid the use of online equipment gas cylinder, thus reduce consumption
Material cost and the cost of labor of replacing consumptive material.
Above in conjunction with accompanying drawing, embodiments of the invention are described, but the invention is not limited in above-mentioned concrete
Embodiment, above-mentioned detailed description of the invention is only schematic rather than restrictive, those of ordinary skill in the art
Under the enlightenment of the present invention, in the case of without departing from present inventive concept and scope of the claimed protection, it may also be made that a lot
Form, within these belong to the protection of the present invention.
Claims (8)
1. the carrier gas cleaning system of a transformer dissolved gas on-line monitoring equipment, it is characterised in that include being sequentially connected with
The pump housing (1), condenser (2), catalytic reactor (3), silica gel tube (5) and 3A molecule screen casing (6), the described pump housing (1) is defeated by air
Delivering in condenser (2), the water vapour in air removed by described condenser (2), and described catalytic reactor (3) is burnt by catalysis
Remove the fuel gas in air, described silica gel and 3A molecule screen casing (6) and remove moisture remaining in air and catalytic reaction product
Raw moisture.
The carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment the most according to claim 1, it is characterised in that
Described catalytic reactor (3) includes shell (301) and the catalysing tube (305) being arranged in described shell (301), described catalysing tube
(305) interior loading catalyst, described catalysing tube (305) outside is provided with heater (303), and described heater (303) outside is provided with
Thermal insulation layer (302), one end of described catalysing tube (305) is connected with air inlet pipe (307), and the other end is connected with escape pipe (308).
The carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment the most according to claim 2, it is characterised in that
One end of described catalysing tube (305) is provided with sealing lid (306), and the described lid (306) that seals is threadeded with catalysing tube (305), institute
State catalysing tube (305) to be made up of the bi-material that thermal coefficient of expansion is different respectively from the threaded connection place sealing lid (306).
The carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment the most according to claim 2, it is characterised in that
The carrier of described catalyst is cerium oxide, and the active component of catalyst is 0.5-5wt%Pd.
The carrier gas cleaning system of transformer dissolved gas on-line monitoring equipment the most according to claim 2, it is characterised in that
Described catalysing tube (305) surface is provided with temperature sensor (304), and described temperature sensor (304) is electrically connected with temperature protection switch
Connect.
6. the carrier gas of a transformer dissolved gas on-line monitoring equipment purifies technique, it is characterised in that comprise the following steps:
S1, removed the part water vapour in air by condenser；
S2, the H burnt by catalysis in removal air2, CO and Hydrocarbon；
The moisture that S3, the moisture thoroughly being removed remnants in air by silica gel and 3A molecule screen casing and catalytic reaction are produced.
The carrier gas of transformer dissolved gas on-line monitoring equipment the most according to claim 6 purifies technique, it is characterised in that
The carrier of the catalyst that described catalysis burning uses is cerium oxide, and the active component of catalyst is 0.5-5wt%Pd.
The carrier gas of transformer dissolved gas on-line monitoring equipment the most according to claim 6 purifies technique, it is characterised in that
The humidity in air after described step S1 processes is not more than 20%.
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Cited By (2)
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| CN106526055A (en) * | 2016-12-13 | 2017-03-22 | 贵州电网有限责任公司都匀供电局 | No-load gas-oil chromatography online monitoring system |
| CN106770962A (en) * | 2016-12-29 | 2017-05-31 | 浙江富春江环保科技研究有限公司 | It is a kind of for dioxin on-line checking except flue gas reclaimed water, the device of sour gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106770962A (en) * | 2016-12-29 | 2017-05-31 | 浙江富春江环保科技研究有限公司 | It is a kind of for dioxin on-line checking except flue gas reclaimed water, the device of sour gas |
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Application publication date: 20161109 |